linux-kernel - Re: [PATCH v1] gpio: tegra: Fix irq_set

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Date:   Fri, 22 Jan 2021 13:55:53 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        Peter Geis <pgwipeout@...il.com>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] gpio: tegra: Fix irq_set_affinity

On Wed, Jan 20, 2021 at 1:46 AM Dmitry Osipenko <digetx@...il.com> wrote:

> The irq_set_affinity callback should not be set if parent IRQ domain
> doesn't present because gpio-tegra driver callback fails in this case,
> causing a noisy error messages on system suspend:
>
>  Disabling non-boot CPUs ...
>  IRQ 26: no longer affine to CPU1
>  IRQ128: set affinity failed(-22).
>  IRQ130: set affinity failed(-22).
>  IRQ131: set affinity failed(-22).
>  IRQ 27: no longer affine to CPU2
>  IRQ128: set affinity failed(-22).
>  IRQ130: set affinity failed(-22).
>  IRQ131: set affinity failed(-22).
>  IRQ 28: no longer affine to CPU3
>  IRQ128: set affinity failed(-22).
>  IRQ130: set affinity failed(-22).
>  IRQ131: set affinity failed(-22).
>  Entering suspend state LP1
>
> Hence just don't specify the irq_set_affinity callback if parent PMC
> IRQ domain is missing. Tegra isn't capable of setting affinity per GPIO,
> affinity could be set only per GPIO bank, thus there is nothing to do
> for gpio-tegra in regards to CPU affinity without the parent IRQ domain.
>
> Tested-by: Peter Geis <pgwipeout@...il.com> # Ouya T30
> Tested-by: Matt Merhar <mattmerhar@...tonmail.com> # Ouya T30
> Tested-by: Dmitry Osipenko <digetx@...il.com> # A500 T20 and Nexus7 T30
> Fixes: efcdca286eef ("gpio: tegra: Convert to gpio_irq_chip")
> Reported-by: Matt Merhar <mattmerhar@...tonmail.com>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

Ick, sorry for the noise!
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij